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https://github.com/edk2-porting/linux-next.git
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6c70b6fc7b
Check the cpu type in the OBP device tree before committing to using the optimized Niagara memcpy and memset implementation. If we don't recognize the cpu type, use a completely generic version. Signed-off-by: David S. Miller <davem@davemloft.net>
78 lines
1.6 KiB
ArmAsm
78 lines
1.6 KiB
ArmAsm
/* GENpage.S: Generic clear and copy page.
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*
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* Copyright (C) 2007 (davem@davemloft.net)
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*/
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#include <asm/page.h>
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.text
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.align 32
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GENcopy_user_page:
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set PAGE_SIZE, %g7
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1: ldx [%o1 + 0x00], %o2
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ldx [%o1 + 0x08], %o3
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ldx [%o1 + 0x10], %o4
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ldx [%o1 + 0x18], %o5
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stx %o2, [%o0 + 0x00]
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stx %o3, [%o0 + 0x08]
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stx %o4, [%o0 + 0x10]
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stx %o5, [%o0 + 0x18]
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ldx [%o1 + 0x20], %o2
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ldx [%o1 + 0x28], %o3
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ldx [%o1 + 0x30], %o4
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ldx [%o1 + 0x38], %o5
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stx %o2, [%o0 + 0x20]
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stx %o3, [%o0 + 0x28]
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stx %o4, [%o0 + 0x30]
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stx %o5, [%o0 + 0x38]
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subcc %g7, 64, %g7
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add %o1, 64, %o1
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bne,pt %xcc, 1b
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add %o0, 64, %o0
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retl
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nop
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GENclear_page:
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GENclear_user_page:
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set PAGE_SIZE, %g7
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1: stx %g0, [%o0 + 0x00]
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stx %g0, [%o0 + 0x08]
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stx %g0, [%o0 + 0x10]
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stx %g0, [%o0 + 0x18]
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stx %g0, [%o0 + 0x20]
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stx %g0, [%o0 + 0x28]
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stx %g0, [%o0 + 0x30]
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stx %g0, [%o0 + 0x38]
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subcc %g7, 64, %g7
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bne,pt %xcc, 1b
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add %o0, 64, %o0
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#define BRANCH_ALWAYS 0x10680000
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#define NOP 0x01000000
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#define GEN_DO_PATCH(OLD, NEW) \
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sethi %hi(NEW), %g1; \
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or %g1, %lo(NEW), %g1; \
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sethi %hi(OLD), %g2; \
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or %g2, %lo(OLD), %g2; \
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sub %g1, %g2, %g1; \
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sethi %hi(BRANCH_ALWAYS), %g3; \
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sll %g1, 11, %g1; \
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srl %g1, 11 + 2, %g1; \
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or %g3, %lo(BRANCH_ALWAYS), %g3; \
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or %g3, %g1, %g3; \
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stw %g3, [%g2]; \
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sethi %hi(NOP), %g3; \
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or %g3, %lo(NOP), %g3; \
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stw %g3, [%g2 + 0x4]; \
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flush %g2;
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.globl generic_patch_pageops
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.type generic_patch_pageops,#function
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generic_patch_pageops:
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GEN_DO_PATCH(copy_user_page, GENcopy_user_page)
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GEN_DO_PATCH(_clear_page, GENclear_page)
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GEN_DO_PATCH(clear_user_page, GENclear_user_page)
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retl
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nop
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.size generic_patch_pageops,.-generic_patch_pageops
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